Resin Composition Suppressing Heat-Induced Discoloration
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Solution Overview
Problem
Resin compositions used in household and electronic appliances face discoloration issues due to heat history during molding, which existing technologies have not adequately addressed.
Innovation Solution
A resin composition comprising cellulose ester, styrene-based resin, and titanium dioxide, with specific mass ratios and additives, is developed to suppress discoloration caused by heat history during molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin composition containing cellulose ester and styrene-based resin is used, then mechanical strength and processability are improved, but discoloration occurs due to heat history during molding
Solution Approach 1:
The patent converts the harmful effect of heat history (which causes discoloration) into a beneficial outcome by adding titanium dioxide as a masking agent. The titanium dioxide absorbs and scatters the discoloration caused by heat, transforming the visual defect into an acceptable appearance while maintaining the mechanical properties of the cellulose ester-styrene resin composition.
Solution Approach 2:
The patent applies color masking by incorporating titanium dioxide pigment into the resin composition. This pigment changes the optical properties of the molded article by scattering light and masking the yellowish discoloration that occurs during heat processing, thereby maintaining aesthetic appearance without affecting the underlying mechanical strength.
2Manufacturing precision
If titanium dioxide is added to mask discoloration, then appearance quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the titanium dioxide content within a specific range (0.1-10 parts by mass per 100 parts of resin) to achieve effective discoloration masking while avoiding excessive complexity in formulation. This parameter optimization allows standard manufacturing processes to be used without requiring complex multi-step procedures or specialized equipment.
Solution Approach 2:
The patent uses titanium dioxide, a readily available and cost-effective pigment, rather than complex or expensive alternative solutions. This approach simplifies manufacturing by using a well-established, easily handled material that can be incorporated into the resin composition through conventional mixing and molding processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively masks discoloration in molded articles by using titanium dioxide, maintaining mechanical strength and flowability while preventing heat-induced color changes.
Implementation Method 1
The composition effectively masks discoloration in molded articles by using titanium dioxide
Data Source
AI summary
A resin composition containing: (A) a cellulose ester, (B) a styrene-based resin, and (C) a titanium dioxide, and not containing a compatibilizer between the component (A) and the component (B), in which the content of the component (A) is within a range of 95 to 50% by mass, the content of the component (B) is within a range of 5 to 50% by mass, and the content of the component (C) relative to 100 parts by mass of the sum of the amount of component (A) and the amount of component (B) is within a range of 0.1 to 10 parts by mass.